Which is a density-independent factor?
a. competition
b. predation
c. earthquakes
d. parasitism
e. disease
ANSWER: c
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Some species require a large and diverse range. Although it may not significantly decrease the overall size of the range, how might fragmenting the range with a freeway or neighborhood lead to the extinction of the entire population, even if sufficient food is available in either region to sustain two smaller populations? Suggest a compromise that would allow the population to survive and allow for the road project or neighborhood.
What will be an ideal response?
Which of the following statements is (are) true?
a. The systolic pressure is determined when the first sound is heard after pumping up the pressure cuff. b. The diastolic pressure is the smaller of the two pressure values. c. The diastolic pressure is determined when the sounds stop as air is released from the cuff. d. Diastole is at the end of the cardiac cycle. e. All of these are true.
The heart of a microarray is a small piece of ____________________ on which single-stranded fragments of DNA are
attached at a spot called a field. Fill in the blank(s) with the appropriate word(s).
The expression "knee-jerk reaction" refers to someone doing something automatically without thinking. What does this expression mean in biological terms?
A) In the nervous system, this expression implies the involvement of higher brain regions before executing a spinal reflex. B) In the nervous system, this expression implies the lack of brain input when executing a spinal reflex. C) This expression implies that the knee-jerk reaction will be shortened in duration following input from higher brain regions. D) This expression implies that only children exhibit this type of unthinking behavior.